"atlantis" with the arm. >> reporter: it was launched, repaired and sfrsed from the shuttle. every major building block was carried up and assembled from shuttle. before becoming nasa's head man, charlie boulden was an astronaut. he flew four shuttle flights, including the hubble launch. >> i defy anybody, i will argue with my apollo comrades, the accomplishments, the achievements, the record of performance, the spinoffs, the capabilities that have been developed, what we did in shuttle over 30 years dwarfed who was done in the apo popollo >> there's no goal, no mission. we are wandering in the desert in space today, period. >> reporter: so why now? why call it quits now?